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This is very interesting - we have North America, with many years of automatic gearboxes and "rest of the world", with, primarily, manual. Early automatics had even more sensitive valves and internal brakes.
It has developed a culture of flushing and changing oil, primarily - probably - due to delicate valves in auto gearboxes in NA- not so in Europe and rest of the world?
Of course ZF and Aisin are playing along and recommend - if not flushing - but changing oil after long time.
I worked for a car manufacturer, who used Aisin automatics - "none" of our customers - nor our testvehicles, ever had an oilchange.
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